Revert "added .buildconfig (autogen from gnome-builder) to gitignore"

This reverts commit 2a92376d9b.

.gitignore

@@ -23,7 +23,6 @@ var/
 *.egg-info/
 .installed.cfg
 *.egg
-.buildconfig
 
 # PyInstaller
 #  Usually these files are written by a python script from a template
@@ -92,4 +91,4 @@ ENV/
 # Secret files (for credentials used in testing)
 *.secret
 pytooter_clientcred.txt
-pytooter_usercred.txt
+pytooter_usercred.txt